Chemistry Examination Discussion

[thushan]

Anyone got a copy of the exam?

[melbourene95]

LOL I forgot to convert the kg to g when working out mol and therefore got like 0.012 days All my calculations were right except it was expressed in g. Reckon I'll only lose 1 mark for this?

yeah that will only loose you a mark! unlucky

[joey7]

With a reason of why the electrolysis or refining of copper may not be accurate, do you reckon this would be accepted: I mentioned molarity of the solution, if the H+ is too high > 1M (non-standard) it could be reduced to H2 preferentially instead of Cu2+... it was the best I could do haha. It's like how electrolysis of brine 4.0M NaCl produces Cl2; do you reckon my conclusion is reasonable?

That sounds right, I wrote that foreign substances may be present that are preferentially reduced?

[rabdog]

LOL I forgot to convert the kg to g when working out mol and therefore got like 0.012 days All my calculations were right except it was expressed in g. Reckon I'll only lose 1 mark for this?

I almost did that then IO had a mini heart attack when I realised and wasted an extra few minutes fixing it up, so I missed out on four easy marks :/

[Chazef]

I said the current may have so high that other species get plated, does that sound reasonable? Also SOMEBODY GIVE THUSHAN THE EXAM

[rabdog]

I found this exam a lot easier then I was expecting, especially since I haven't been able to find my text book to revise properly.  I think my big issue was time because I wrote way too much for some things

[charmanderp]

Anyone got a copy of the exam?

I've given up haha. Been waiting anxiously for it for 4 hours now. I think we'll get a copy of next year's exam before today's one at this rate.

[Sentar]

The exam was fairly easy, but with a new study deisgn that's usual, the first one is almost always fairly easy, as they think people won't do as well since they don't have accurate information from past years to help. Physics tomorrow will probably be quite similar.

[saraoj]

With a reason of why the electrolysis or refining of copper may not be accurate, do you reckon this would be accepted: I mentioned molarity of the solution, if the H+ is too high > 1M (non-standard) it could be reduced to H2 preferentially instead of Cu2+... it was the best I could do haha. It's like how electrolysis of brine 4.0M NaCl produces Cl2; do you reckon my conclusion is reasonable?

I said that the Copper in the electrolyte/solution (CuSo4) could also reduce to form Cu rather than only coming from the impure lump? Is that correct?

[Mafioso]

How many marks was that copper accuracy question?

[aestheticatar]

Today's exam was okay considering the amount of time I put into studying for it. So glad I placed my efforts into cramming for other subjects throughout the past few days over chemistry. For a couple questions, I was super iffy. But I probably would've messed them up regardless of whether I studied for a few extra days anyway. Other than that, I will be praying and hoping the cut off doesn't get too high this year. Hope all of you guys achieved your best!

[hurdles]

I also said the initial copper solution will be reduced to solid copper!

[achre]

Anyone got a copy of the exam?

Just ahead of getting a copy of the actual exam, your practice exam's guesses at what the extended response questions would look like weren't that far off.

[presto]

Does anyone know the exact wording of that copper refining question?
If I remember correctly, didn't it ask for a reason for having different values for the mass of the copper plate after the electrolysis?
I think I may have thought too simply when I said it may not have been completely dry when weighed. 

[beastly101]

My answer was more simplistic, I think I just said some of the copper plating 'falling off' haha.